Khozmo. Furnish him with your system parameters (input and output impedance, speaker sensitivity, amplifier gain) , and he will design a solution for you. Wonderfully built, affordable, astonishingly transparent. It took a long while to dislodge my Slagle/Intact Audio autoformers, but the Khozmo is better.
I’m pleased to say that my new Khozmo Acoustic Passive Pre is now streaming music and burning in nicely. As palasr noted, all the above is true: AMAZING build quality, balanced listening is dramatically different, and most importantly, Arek responded to all communications within minutes, I was never left hanging. Communication is EVERYTHING. WELL worth it.